From: Toshi Kani <toshi.kani@hpe.com>
To: snitzer@redhat.com
Cc: linux-nvdimm@ml01.01.org, dm-devel@redhat.com,
linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org,
Toshi Kani <toshi.kani@hpe.com>, Alasdair Kergon <agk@redhat.com>,
Dan Williams <dan.j.williams@intel.com>,
Ross Zwisler <ross.zwisler@linux.intel.com>
Subject: [PATCH] dm stripe: add DAX support
Date: Fri, 24 Jun 2016 12:23:30 -0600 [thread overview]
Message-ID: <1466792610-30369-1-git-send-email-toshi.kani@hpe.com> (raw)
Change dm-stripe to implement direct_access function,
stripe_direct_access(), which maps bdev and sector and
calls direct_access function of its physical target device.
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Alasdair Kergon <agk@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
---
drivers/md/dm-stripe.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 48f1c01..8925f6a 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -308,6 +308,30 @@ static int stripe_map(struct dm_target *ti, struct bio *bio)
return DM_MAPIO_REMAPPED;
}
+static long stripe_direct_access(struct dm_target *ti, sector_t sector,
+ void __pmem **kaddr, pfn_t *pfn, long size)
+{
+ struct stripe_c *sc;
+ struct block_device *bdev;
+ uint32_t stripe;
+ struct blk_dax_ctl dax = {
+ .size = size,
+ };
+ long ret;
+
+ sc = ti->private;
+ stripe_map_sector(sc, sector, &stripe, &dax.sector);
+
+ dax.sector += sc->stripe[stripe].physical_start;
+ bdev = sc->stripe[stripe].dev->bdev;
+
+ ret = bdev_direct_access(bdev, &dax);
+ *kaddr = dax.addr;
+ *pfn = dax.pfn;
+
+ return ret;
+}
+
/*
* Stripe status:
*
@@ -425,6 +449,7 @@ static struct target_type stripe_target = {
.status = stripe_status,
.iterate_devices = stripe_iterate_devices,
.io_hints = stripe_io_hints,
+ .direct_access = stripe_direct_access,
};
int __init dm_stripe_init(void)
next reply other threads:[~2016-06-24 18:23 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-24 18:23 Toshi Kani [this message]
2016-06-24 18:29 ` dm stripe: add DAX support Mike Snitzer
2016-06-24 18:42 ` Kani, Toshimitsu
2016-07-12 22:22 ` Kani, Toshimitsu
2016-07-13 2:01 ` Mike Snitzer
2016-07-13 15:03 ` Kani, Toshimitsu
2016-07-21 0:01 ` Mike Snitzer
2016-07-21 3:03 ` Jens Axboe
2016-06-24 19:58 ` [PATCH] " kbuild test robot
2016-06-24 20:02 ` Mike Snitzer
2016-06-24 20:46 ` Kani, Toshimitsu
2016-06-24 19:59 ` [PATCH] " kbuild test robot
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